文档介绍：一、构成(gòuchéng):
have/has+动词(dòngcí)过去分词
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二、含义(hányì):
(定义(dìngyì)一), yet, ever, never, just, before等.
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句式(jù shì)构成
:
S(主语(zhǔyǔ)）+have/has(助动词）+PP(过去分词)+(其他）。
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2. 否定句:
S ( 语)+have/has+not +PP(过去分词)+(其他(qítā)）。
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(yībān)疑问句
Have/has+ S (主语(zhǔyǔ))+PP(过去分词)?
Yes, S+have/has.
No, S+have/hasn’t.
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（改为(ɡǎi wéi)否定句和一般疑问句并肯否回答) I have seen him since his wedding day.
→I haven’t seen him since his wedding day .
→Have you seen him since his wedding day?
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He has written to me since I have been ill.(改为(ɡǎi wéi)一般疑问句)
→ Has he written to you since you have been ill?
→ He hasn’t written to me since I have been ill
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不规则动词原型-过去(guòqù)式-过去(guòqù)分词形式：
1） AAA型(三种都一样(yīyàng))
如：cost cost cost cut cut cut hurt hurt hurt shut shut shut set set set
2）ABB型(过去式与过去分词相同)
如: bring-brought-brought catch caught caught lead led led
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3） ABC型(三种(sān zhǒnɡ)都不一样)
如：begin-began-begun
grow grew grown ring rang rung break broke broken
4）ABA型(原形与过去分词相同)
如: come-came-come
become became become run ran run
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1. 现在完成时中标志词的用法(yònɡ fǎ)区别
肯定句: 句中(助后实前)/句末 “己经”
一般疑问句: 句末(表示惊讶(jīngyà)的语气) “难道”
Eg. I’ve already had breakfast. (更常见)
= I’ve had breakfast already.(表示(biǎoshì)强调)
Have you had breakfast already?
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